import type { Scene } from 'three';
/** Whether modeled exterior ground replaces this scene's fallback horizon disc. */
export declare function useSceneGroundReplacement(): boolean;
/**
 * The same claim from outside React (a map layer that hangs its own meshes on
 * the scene): returns the release. The last release restores the fallback.
 */
export declare function claimSceneGround(scene: Scene): () => void;
/** Mount alongside replacement ground. The last release restores the fallback. */
export declare function SceneGroundReplacement(): null;
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